Molding apparatus.



A. G. WARD. MOLDING APPARATUS. APPLICATION PILnnrnB. 24, 1909.

Patented Mar. 15,1910.

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APPLICATION IILED' FEB. 24, 1909..

Patented Mar. 15, 1910.

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A. G. WARD. I MOLDING APPARATUS, APPLICATION FILED FEB. 24, 1909.

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ALMON G. WARD, OF WARREN, OHIO, ASSIGNOR TO THE DAY WARD COMPANY, OF WARREN, OHIO, A CORPORATION OF OHIO.

MOLDING APPARATUS.

To all whom it may concern:

Be it known that I, ALMoN G. WARD, a citizen of the United States, and resident of Warren, Trumbull county, Ohio, have invented certain new and useful Improvements in Molding Apparatus, of which the following is a specification.

This invention relates to an apparatus for forming sand into molds into which molten metal can be poured to form castings and its novelty consists in the construction and adaptation of the parts as will be more fully hereinafter pointed out. In an apparatus of this kind it is necessary in forming molds for castings of large articles that the sand should be packed tightly but not too tight to prevent proper venting during the casting operation, that the parts of the apparatus should be simple because it must be handled by comparatively unskilled labor and that it must be economical in use in order to offer any advantage over the employment of hand labor. I believe that I have secured all of the desired advantages and requirements in the apparatus herein described.

In the drawings, Figure 1 is a partial side elevation and central vertical section of an apparatus embodying my invention, the flask and outer pattern being shown with the sand in place but not compressed; Fig. 2 is a similar view showing the sand compressed; Fig. 3 is a View similar to Fig. 1 showing the inner pattern; Fig. 4 is a central transverse vertical section on the plane of the line 44 in Fig. 8; Fig. 5 is a central transverse vertical section on the plane of the line 55 in Fig. 1; Fig. 6 is a top plan View of the combined flask and compressor; Fig. 7 is a partial side elevation and vertical section of the assembled molds and flasks and Fig. 8 is a detail of a modified form of the sand ring.

In the drawings, the machine comprises uprights 1, a head 2 and a platform 3, the latter adapted to be vertically moved in the uprights by means of a hydraulic press indicated at 4, 4, 4. The platform is supplied with suitable rails or tracks 5 adapted to receive a car 6 on which the pattern is placed. A false head 7 is suitably secured to the head 2 and is adapted to receive and support the flask members.

10 is a flask-member A adapted to cooperate with the outer pattern of the article to be molded, in the case shown, a bath tub.

Specification of Letters Patent.

Application filed February 24, 1909.

Patented Mar. 15, 1910. Serial No. 479,816.

It comprises sloping sides 11, 11, made internally in the form of steps and it is provided with transverse ribs 12. Trunnions 13, 13, are made integral with, or secured to, its outer surface, which is perforated at 14 to increase the strength of adhesion of the sand and to afford ventilation. Means are provided for detachably securing this flask member to the false head 7 consisting of lugs 15 and 16 projecting respectively from the false head and the flask-member comprising a rod 17 pivoted to the lug 16 and having an eye at its upper end and a key adapted to pass through the eye and an aperture in the lug 16. Gate forming members 19 are secured to the false head 7 or to the flaskmember 10, as may be most convenient.

A pattern 20 is suitably supported on the car 6. In Figs. 1, 2 and 5 this pattern is the one used for forming the outer mold. It is made with internal reinforcing ribs 21 on account of its large size and needs no special description.

The car 6 is provided with removable projecting brackets or pegs 22. On them and encircling the pattern 20 is a sand retaining device 24 in the shape ofan oblong ring which completely surrounds the pattern. It is provided at its upper edge with lugs 26 each provided with a pivoted eye 27 adapted to engage lugs projecting from the lower edge of the flask-member and to which lugs they are coupled by keys, or in any other suitable manner.

The manner of operating the device above described is as follows :The parts are assembled in the positions shown in Fig. l. The space between the pattern 20 and sand ring 24 is then filled with sand. The hydraulic press is then operated to move the platform 3 and head 2 toward each other and the flask-member 10 is coupled to the sand ring 24 by means of the lugs 25 and 26 and eye pieces 27. The pegs 22 are then removed, so that the sand ring 24 is supported solely from the flask-member. The press being again operated to move the parts together the flask-member and pattern approach each other and the sand is compressed between them, until it reaches the proper degree of compression illustrated in Fig. 2. The sloping stepped sides of the flask-member 10 serve as a compressor to press the sand against the pattern in the direction of the movement of the flask-member and pattern, the false head 7 pressing the sand directly against the flat upper surface of the pattern and any lateral movement or distribution of the sand is prevented by the transverse ribs 12. The gate forming members have during the movement of the flaskmember and pattern formed proper pouring depressions in the sand. These members are of such size that when the compressive movement is completed the mouth of the apertures is at a level with the outer surface of the pattern. It will be noted that as the pattern and flask-member move toward each other the sand retaining ring 24 is forced downward past the fiat tip of the car 6 but that the body of sand is always supported by that portion of the ring above the patterns upper surface. hen the molding operation has thus been completed, the movement of the press is reversed and the pattern is withdrawn from the flask-member until it regains its former position. The pegs 22 are again reinserted and the ring 24 uncoupled from the fiaskmember which contains the compressed mold. The flask-member is then disengaged from the false head of the press and removed by means of the trunnions 13 with which it is provided, and the car 6 carrying the pattern and sand ring are removed to be again charged with sand and another flask-member is inserted in the press.

In Figs. 3 and 4t, 30 designates a flaskmember B adapted to cooperate with the inner pattern of the article to be molded. This flask-member B comprises sloping sides 31, made externally in the form of steps and it is provided with transverse ribs 32. Trunnions 33 are made integral with or secured to its outer surface. In this case the pattern 20 is made with an external reinforcing framework 28 and is provided with pegs 29 to support the sand retaining ring 24, which, in this case, is provided with trunnions 34 by which it may be moved. It is also provided with lugs 36 and eyes 37 by which through lugs 35 on the flask-member it may be coupled to the latter. The false head of the press 2 is in this case supplied with a presser 39. The manner of ope 'ating these parts is substantially similar to that employed when the flask-member A is used. The parts are assembled as shown in Fig. 3. The interior of the pattern is first filled with sand, then the sand ring is placed in position and the flask-member inserted and the remainder of the space between it and the pattern and ring filled with sand. The flask-member and sand ring are then coupled together and the supporting pegs 29 are removed. The car 6 and head are then moved together until the presser 39 fits inside of the flask-member and the false head 7 presses against its upper surface, when the movement being continued the sand is compressed between the flask-member and the pattern to form the mold. As before, any lateral movement or distribution of the sand with respect to the pattern is prevented by the ribs 32 and the stepped sides of the flaskmember and the compression of the sand is directly in line with that of the movement of the parts. \Vhen the molding operation has thus been completed the movement of the press is reversed until the car 6 regains its original position, the flask-member and sand ring are then uncoupled and reversed and the pattern is removed, and the sand ring and pattern are ready for another charge of sand. After the fiaskanembers A and B have been both filled with molded sand in the manner described, they are assembled in the usual manner as illustrated in Fig. 7 and the casting operation takes place, the molten metal being poured through the gate aperture formed in the mold within the flask-member A.

In Fig. 8 a modified form of the sand ring is illustrated. In this case it is shown made in sections secured together by bolts, or in any other suitable manner, so that when the sand is wet or it is desired for any other reason to use less of it, the efiective depth of the sand ring may be varied.

By the use of this apparatus the operation of making molds of large articles is facilitated and made much cheaper.

hat I claim as new is 1. In a molding apparatus, a plurality of relatively movable opposing members, one of which is for the pattern, and a separate member which moves with one of said members during a part of such relative movement and relatively thereto during the remainder of the same.

2. In molding apparatus, the combination with relatively movable flask and pattern members, of a sand retaining device that surrounds the pattern member, the sand retaining device and each of the members being relatively movable, and relatively fixed during different portions of the relative movement of the members.

3. In molding apparatus, the combination with means for supporting a flask member, of a pattern, a sand retalning device that surrounds the pattern, and means for effecting the initial simultaneous movement of the pattern and device, and a subsequent movement of the pattern with respect to the device.

4. In molding apparatus, the combination with means for supporting the flask member, of a pattern, means for moving the pattern, a sand retaining device, and means for alternately supporting the device on the pattern moving means and the flask member.

5. In molding apparatus, the combination with a combined presser and flask member,

of means for fixedly supporting the same, a pattern member movable toward and from the combined presser and flask member, a sand retaining ring that surrounds the pat- 1 tern member, means for temporarily c011- necting the pattern member and ring to cause the same to move together, and means for detachably securing the ring to the combined presser and flask member.

6. In an apparatus of the kind described, the combination with a pattern and its support, a compressor and means for moving the support and compressor relative to each other, of a sand retaining device, and means for holding it fixed with relation to the compressor when desired, and comprising a coupling adapted temporarily to join the two together.

7 In an apparatus of the kind described,

4 a combined flask and presser, a pattern and its support, means for moving these parts relative to each other, and a sand ring, means for temporarily securing it to the pattern support and means for relatively moving the sand ring and support.

8. In an apparatus of the kind described, a combined flask and presser, a pattern and its support, means for moving these parts relative to each other, a sand ring, means for temporarily securlng it to the pattern support, means for relatively moving the b relative lateral movement of the sand under pressure toward the pattern.

10. In molding apparatus, the combination with a pattern member, of a pressure member, generally sloping wall provided with a series of abutment shoulders that are opposed to the direction of pressure, and prevent general deviation of the sand under pressure toward the pattern.

11. In molding apparatus, a combined flask and presser member, having sloping sand engaging sides provided with sand engaging steps.

12. In an apparatus of the kind described, a flask-member having outwardly sloping sides, the interior surface of which is arranged in a series of relatively fixed sandengaging steps.

13. I11 an apparatus of the kind described,

a flask-member having inwardly sloping sides, the exterior surface of which is arranged in a series of relatively fixed sandengaging steps.

. 142. A sand molding machine comprising a pattern and means for supporting the same, a sand retaining device having an unobstructed interior and adapted to encircle the pattern, and means for varying the eifective size of the said retaining device.

Vitness my hand this 20th day of Feb ruary, 1909, at I/Varren, Ohio.

ALMON G. WARD.

WVitnesses:

WILLIAM R. BAIRD, ALAN C. McDoNNELL. 

